Computer trackball



FIG. 1 is a perspective view of a computer trackball showing our newdesign;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view, the left side elevational viewbeing a mirror image;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The ornamental design for a computer trackball, as shown and described.